I have a jsf-guessNumber.war file that I use as part of my initial testing. I drop this jsf-guessNumber.war into tomcat and it works. I drop this into jboss-4.0.4GA and it doesnt work I get the following error java.lang.NullPointerException at javax.faces.webapp.UIComponentTag.setupResponseWriter(UIComponentTag.java:615) So I downloaded jboss-4.0.5.rc1 and dropped it into that version. It also did not work. I then downloaded jboss-4.0.2 and dropped it into that version AND IT WORKED! So jboss-4.0.2 works, jboss-4.0.4 and jboss-4.0.5 DONT WORK. I suggest to jboss to get the jsf-guessNumber.war file and include in their regression testing. The jsf-guessNumber is the java server faces tutorial from sun. Looking forward to any comments. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3977413#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...